Abstract
Forward logistic regression has allowed us to derive an earth-flow susceptibility model for the Tumarrano river basin, which was defined by modeling the statistical relationships between an archive of 760 events and a set of 20 predictors. For each landslide in the inventory, a landslide identification point (LIP) was automatically produced as corresponding to the highest point along the boundary of the landslide polygons, and unstable conditions were assigned to cells at a distance up to 8 m. An equal number of stable cells (out of landslides) was then randomly extracted and appended to the LIPs to prepare the dataset for logistic regression. A model building strategy was applied to enlarge the area included in training the model and to verify the sensitivity of the regressed models with respect to the locations of the selected stable cells. A suite of 16 models was prepared by randomly extracting different unoverlapping stable cell subsets that have been appended to the unstable ones. Models were finally submitted to forward logistic regression and validated. The results showed satisfying and stable error rates (0.236 on average, with a standard deviation of 0.007) and areas under the receiver operating characteristic (ROC) curve (AUCs) (0.839 for training and 0.817 for test datasets) as well as factor selections (ranks and coefficients). As regards the predictors, steepness and large-profile and local-plan topographic curvatures were systematically selected. Clayey outcropping lithology, midslope drainage, local and midslope ridges, and canyon landforms were also very frequently (from eight to 15 times) included in the models by the forward selection procedures. The model-building strategy allowed us to produce a performing earth-flow susceptibility model, whose model fitting, prediction skill, and robustness were estimated on the basis of validation procedures, demonstrating the independence of the regressed model on the specific selection of the stable cells.
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Acknowledgments
The findings and discussion of this research were carried out in accordance with the bilateral agreements between the University of Palermo and the University of Granada supporting an international PhD program. All authors have commonly shared all parts of the paper. This research was supported by the project SUFRA_SICILIA funded by the Department of Earth and Sea Sciences of University of Palermo and the “Assessorato Regionale Territorio e Ambiente della Regione Sicilia”. Clare Hampton has linguistically edited the final version of this text. Authors wish to thank two anonymous referees who have allowed us to improve the quality of the paper.
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Costanzo, D., Chacón, J., Conoscenti, C. et al. Forward logistic regression for earth-flow landslide susceptibility assessment in the Platani river basin (southern Sicily, Italy). Landslides 11, 639–653 (2014). https://doi.org/10.1007/s10346-013-0415-3
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DOI: https://doi.org/10.1007/s10346-013-0415-3